Re: use-when

I cannot figure out how to use use-when attribute, beyond standard "system-property('file-separator')" example.

  There are no syntactic constraints on the XPath expression that
  can be used as the value of the use-when attribute. However,
  there are severe constraints on the information provided in its
  evaluation context. These constraints are designed to ensure
  that the expression can be evaluated at the earliest possible
  stage of stylesheet processing, without any dependency on
  information contained in the stylesheet itself or in any source
  document.

My code is overflown w/ "conditional" templates like:

<xsl:template match="some-xpath1[$file-set='A']">
<xsl:template match="some-xpath2[$file-set='B']">
<xsl:template match="some-xpath3[$file-set='C']">

$file-set is declared as parameter, but it is not really a parameter, it is the same for all files converted in a set, other parameters vary for each file.

I think System.setProperty("file-set", "A") is not a good choice, because there can be many transforms running in the background.

How to properly rewrite above "pseudo" use-when to "true" use-when, i.e.:
<xsl:template match="some-xpath1" use-when="user-property('file-set')='A'">
p.s.
I use Saxon-9 HE

<xsl:choose>
  <xsl:when test="$file-set='A'">
    <xsl:apply-templates mode="file-set-A"/>
  </xsl:when>
  <xsl:when test="$file-set='B'">
    <xsl:apply-templates mode="file-set-B"/>
  </xsl:when>
  <xsl:when test="$file-set='C'">
    <xsl:apply-templates mode="file-set-C"/>
  </xsl:when>
</xsl:choose>

<xsl:template match="some-xpath1" mode="file-set-A">
<xsl:template match="some-xpath2" mode="file-set-B">
<xsl:template match="some-xpath3" mode="file-set-C">

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